Walnut tree, fruit

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Sushmita Jha

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Oct 4, 2010, 1:46:18 PM10/4/10
to indiantreepix
These images have been taken by my brother, Somnath Jha, who is based in Srinagar.
walnut-tree.jpg
walnut-fruit.jpg
walnut-crop.jpg
walnut - split.bmp

mani nair

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Oct 4, 2010, 1:59:51 PM10/4/10
to Sushmita Jha, indiantreepix
Sushmita ji, nice photos. Last year during our visit to Kashmir we go to see lots of Walnut trees with immature fruits. The tree is very beautiful and  is allelopathic - meaning it does not allow any other plants to grow under or near it.

Thanks for sharing

Regards,

Mani.

Sushmita Jha

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Oct 4, 2010, 2:08:22 PM10/4/10
to mani nair, indiantreepix
Thank you, Mani ji. I did not know that walnut is an allelopathic tree. What are the other common trees that are allelopathic? Are neem and banyan?
Regards,
Sushmita Jha

Gurcharan Singh

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Oct 4, 2010, 3:15:10 PM10/4/10
to Sushmita Jha, mani nair, indiantreepix
Yes walnut is the commonest example of allelopathy I would tell my students. Hardly any plant grows beneath it. 


-- 
Dr. Gurcharan Singh
Retired  Associate Professor
SGTB Khalsa College, University of Delhi, Delhi-110007
Res: 932 Anand Kunj, Vikas Puri, New Delhi-110018.
Phone: 011-25518297  Mob: 9810359089
http://people.du.ac.in/~singhg45/ 

Gurcharan Singh

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Oct 4, 2010, 11:42:08 PM10/4/10
to Sushmita Jha, mani nair, indiantreepix
Here are the photographs of Black walnut, Juglans nigra from California in USA.


-- 
Dr. Gurcharan Singh
Retired  Associate Professor
SGTB Khalsa College, University of Delhi, Delhi-110007
Res: 932 Anand Kunj, Vikas Puri, New Delhi-110018.
Phone: 011-25518297  Mob: 9810359089
http://people.du.ac.in/~singhg45/ 

Juglans-nigra-California-2.jpg
Juglans-nigra-California-1.jpg

Sushmita Jha

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Oct 5, 2010, 12:45:09 AM10/5/10
to Gurcharan Singh, mani nair, indiantreepix
Thank you for sharing, Gurcharan ji. The leaves look so different!
Sushmita

Sangeetha

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Oct 5, 2010, 12:32:33 PM10/5/10
to efloraofindia
Hi Sushmita ji,

Tamarind also exhibits allelopathic effect.

Regards,
Sangeeth mallika

On Oct 4, 11:08 pm, Sushmita Jha <sushmitas...@gmail.com> wrote:
> Thank you, Mani ji. I did not know that walnut is an allelopathic tree. What
> are the other common trees that are allelopathic? Are neem and banyan?
> Regards,
> Sushmita Jha
>
>
>
> On Mon, Oct 4, 2010 at 11:29 PM, mani nair <mani.na...@gmail.com> wrote:
> > Sushmita ji, nice photos. Last year during our visit to Kashmir we go to
> > see lots of Walnut trees with immature fruits. The tree is very beautiful
> > and  is allelopathic - meaning it does not allow any other plants to grow
> > under or near it.
>
> > Thanks for sharing
>
> > Regards,
>
> > Mani.
> >  *
> > *<http://earthfriendlygardening.wordpress.com/2006/11/30/allelopathic-p...>
>
> > On Mon, Oct 4, 2010 at 11:16 PM, Sushmita Jha <sushmitas...@gmail.com>wrote:
>
> >> These images have been taken by my brother, Somnath Jha, who is based in
> >> Srinagar.- Hide quoted text -
>
> - Show quoted text -

Satish Phadke

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Oct 5, 2010, 12:44:35 PM10/5/10
to Sangeetha, efloraofindia
I suppose some conifers like pinus roxburghii also have this property.
Due to the acidic nature of dried leaves which fall on the ground no other vegetation can grow. Am I right?

Rashida Atthar

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Oct 5, 2010, 12:47:31 PM10/5/10
to Satish Phadke, Sangeetha, efloraofindia
Good to see Walnut tees from India and California! Thanks Sushmita ji and Dr. Gurcharan ji.

regards,
Rashida.

Yazdy Palia

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Oct 5, 2010, 1:20:19 PM10/5/10
to Gurcharan Singh, Sushmita Jha, mani nair, indiantreepix
Dr. Gurcharan Singh Ji,
I do not know about walnut tree and allelopathy. I have seen that
nothing grows under a tree where the shade is so thick that no
sunlight penetrates. I have seen someone claim that tamarind tree has
also the allelopathy effect. I can not agree to that as I have a
couple of them and we have coffee growing very well underneath it. I
had a very healthy pepper vine on them and also thick growth of weeds
growing under its shade.
It is worth observing the rainfall in the area where such observations
are made. Another point to be observed is are the walnut trees so
close to each other that no sunlight penetrates under the thick
canopy.
We have a few jack fruit trees so close to each other and no weeds
would grow underneath it in spite of very nice mulch and nice loamy
soil. Once we regulated the shade, we found lush growth underneath it.
This though is the observation of a lay person.
Regards
Yazdy.

Sangeetha

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Oct 5, 2010, 2:13:18 PM10/5/10
to efloraofindia
Palia ji,

Tamrind root exudates have allelopathic competence and are evaluated
for sustainable weed management programs.
The bark and the seeds have differential (inhibitory and excitatory)
allelopathic effects. They have some growth regulators which
additively or synergestically involve in plant specific expression.

Regards,
Sangeeth mallika
> > Phone:011-25518297begin_of_the_skype_highlighting              011-25518297      end_of_the_skype_highlighting  Mob:9810359089begin_of_the_skype_highlighting              9810359089      end_of_the_skype_highlighting
> >http://people.du.ac.in/~singhg45/
>
> > On Mon, Oct 4, 2010 at 11:08 AM, Sushmita Jha <sushmitas...@gmail.com>
> > wrote:
>
> >> Thank you, Mani ji. I did not know that walnut is an allelopathic tree.
> >> What are the other common trees that are allelopathic? Are neem and banyan?
> >> Regards,
> >> Sushmita Jha
> >> On Mon, Oct 4, 2010 at 11:29 PM, mani nair <mani.na...@gmail.com> wrote:
>
> >>> Sushmita ji, nice photos. Last year during our visit to Kashmir we go to
> >>> see lots of Walnut trees with immature fruits. The tree is very beautiful
> >>> and  is allelopathic - meaning it does not allow any other plants to grow
> >>> under or near it.
>
> >>> Thanks for sharing
>
> >>> Regards,
>
> >>> Mani.
>
> >>> On Mon, Oct 4, 2010 at 11:16 PM, Sushmita Jha <sushmitas...@gmail.com>
> >>> wrote:
>
> >>>> These images have been taken by my brother, Somnath Jha, who is based in

Shantanu

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Oct 5, 2010, 2:26:49 PM10/5/10
to efloraofindia
Hi Sangeeth ji
nice info about the allelopathic effects of tamarind exudates.

regards
Shantanu : )
> > - Show quoted text -- Hide quoted text -

Yazdy Palia

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Oct 5, 2010, 8:57:07 PM10/5/10
to Sangeetha, efloraofindia
Sangeetha Ji,
Thank you for the enlightenment. You will observe that I have
mentioned that these are the observation of a lay person. For your
reference, I will send you the picture of the growth under my tamarind
tree a few hours later. Thank you once again. I would love to receive
the study that has been conducted on the subject.
Regards
Yazdy.

Gurcharan Singh

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Oct 5, 2010, 11:13:10 PM10/5/10
to Yazdy Palia, Sangeetha, efloraofindia
Yazdy ji
I don't know much about Tamarindus but Juglans allelopathic effects I know even before I was a student of botany. Hardly any plant grows beneath or in the vicinity of Walnut tree. Juglans (both species J. nigra the black walnut of America and J. regia, the English walnut) leaves, bark, stem, fruit pericarp and roots contain a colourless non-toxic chemical hydrojuglone. When exposed to air or soil chemicals it is oxidized into highly toxic allelochemic compound juglone. Rain washes juglone from leaves and other parts and carries it into soil. It is toxic to both herbaceous and woody species.
   Just for additional information, bark of Juglans fresh or dried is used for cleaning teeth in the same way as Acacia twigs in many parts of North India (Datun). On exposure to air and convertion to juglone the gums get orange-red colour, and is especially used by ladies to both clean teeth and colour gums.

But then there are always plants which are resistant to juglone, and these can grow/can be planted adjacent to Juglans trees. Among trees the resistant species are various species of maple, Ailanthus glandulosa, Quince, Red cedar, Sweetgum, pine, oak and Black locust (we often find this Robinia pseudoacacia growing alongside Juglans in Kashmir). Among shrubs and climbers Roses, Grape vine,  Hazelnut and Thuja are resistant. Several herbaceous plants like species of Brassica, Cichorium, Convolvulus, etc. also manage to grow.

Not having first hand information but the plants growing or grown under Tamarind may similarly be resistant to Tamarind allelopathy.

  


-- 
Dr. Gurcharan Singh
Retired  Associate Professor
SGTB Khalsa College, University of Delhi, Delhi-110007
Res: 932 Anand Kunj, Vikas Puri, New Delhi-110018.
Phone: 011-25518297  Mob: 9810359089
http://people.du.ac.in/~singhg45/ 

Yazdy Palia

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Oct 6, 2010, 12:43:04 AM10/6/10
to Sangeetha, efloraofindia
Dear Sangeetha Ji,
Am attaching pictures of a tamarind tree with the luxurious growth of
other plants beneath its shade. I would appreciate if any more light
is thrown on the subject. It would be very useful for a farmer.
Regards
Yazdy.
DSCN3470.JPG

Sangeetha

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Oct 6, 2010, 12:51:11 AM10/6/10
to efloraofindia
Palia ji,

Please find the study in the links given below. Hope its useful to
you.

http://www.springerlink.com/content/xx2j657m24twu832/
http://www.springerlink.com/content/p21qhl0431018786/

Regards,
Sangeetha
> >> > Phone:011-25518297begin_of_the_skype_highlighting              011-25518297      end_of_the_skype_highlightingbegin_of_the_skype_highlighting              011-25518297      end_of_the_skype_highlighting  Mob:9810359089begin_of_the_skype_highlighting              9810359089      end_of_the_skype_highlightingbegin_of_the_skype_highlighting              9810359089      end_of_the_skype_highlighting
> >> >http://people.du.ac.in/~singhg45/
>
> >> > On Mon, Oct 4, 2010 at 11:08 AM, Sushmita Jha <sushmitas...@gmail.com>
> >> > wrote:
>
> >> >> Thank you, Mani ji. I did not know that walnut is an allelopathic tree.
> >> >> What are the other common trees that are allelopathic? Are neem and banyan?
> >> >> Regards,
> >> >> Sushmita Jha
> >> >> On Mon, Oct 4, 2010 at 11:29 PM, mani nair <mani.na...@gmail.com> wrote:
>
> >> >>> Sushmita ji, nice photos. Last year during our visit to Kashmir we go to
> >> >>> see lots of Walnut trees with immature fruits. The tree is very beautiful
> >> >>> and  is allelopathic - meaning it does not allow any other plants to grow
> >> >>> under or near it.
>
> >> >>> Thanks for sharing
>
> >> >>> Regards,
>
> >> >>> Mani.
>
> >> >>> On Mon, Oct 4, 2010 at 11:16 PM, Sushmita Jha <sushmitas...@gmail.com>
> >> >>> wrote:
>
> >> >>>> These images have been taken by my brother, Somnath Jha, who is based in
> >> >>>> Srinagar.- Hide quoted text -
>
> >> - Show quoted text -- Hide quoted text -

Pankaj Kumar

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Oct 6, 2010, 2:38:18 AM10/6/10
to Sangeetha, efloraofindia
Allelopathic effects may differ according to the climatic conditions
of the area.
Pankaj

--
***********************************************
"TAXONOMISTS GETTING EXTINCT AND SPECIES DATA DEFICIENT !!"


Pankaj Kumar Ph.D. (Orchidaceae)
Research Associate
Greater Kailash Sacred Landscape Project
Department of Habitat Ecology
Wildlife Institute of India
Post Box # 18
Dehradun - 248001, India

Pankaj Oudhia

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Oct 6, 2010, 2:43:50 AM10/6/10
to efloraofindia
Agreed with Pankaj Ji. And Allelopathy never means only suppression. Both inhibitory as well as stimulatory Allelopathic interactions exist in Nature.

regards

Pankaj Oudhia

Yazdy Palia

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Oct 6, 2010, 3:23:58 AM10/6/10
to Sangeetha, efloraofindia
Thank You Sangeetha Ji, Pankaj Kumar Ji and Pankaj Oudhia ji.
Thanks to you , I have learn t something today.
Regards
Yazdy.

On Wed, Oct 6, 2010 at 10:21 AM, Sangeetha <sangeeth...@gmail.com> wrote:

J.M. Garg

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Oct 24, 2010, 10:08:07 AM10/24/10
to Sushmita Jha, indiantreepix, Gurcharan Singh
As per another thread:
"English Walnut Juglans regia
...
--
Dr. Gurcharan Singh"

On 4 October 2010 23:16, Sushmita Jha <sushmi...@gmail.com> wrote:
These images have been taken by my brother, Somnath Jha, who is based in Srinagar.



--
With regards,
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Padmini Raghavan

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Oct 24, 2010, 2:40:42 PM10/24/10
to Pankaj Kumar, Sangeetha, efloraofindia
What allelopathic effects does Grevillea  robusta have?
Thanks,
Padmini Raghavan.

On Wed, Oct 6, 2010 at 12:08 PM, Pankaj Kumar <sahani...@gmail.com> wrote:
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